Java之Servlet编程实例一

最新推荐文章于 2025-06-27 10:08:36 发布

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最新推荐文章于 2025-06-27 10:08:36 发布

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本文介绍了一个使用Servlet从登录表单获取用户输入数据并打印到控制台的具体示例。包括LoginServlet类的创建、login.jsp页面的设计及web.xml配置。

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用Servlet将在浏览器页面输入的数据在控制台打印出来Servlet

1，新建LoginServlet类

package com.djx.sevlet;

import java.io.IOException;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.sun.net.httpserver.HttpServer;
import com.sun.net.httpserver.HttpsServer;

import sun.security.krb5.internal.SeqNumber;

public class LoginServlet extends HttpServlet{
	/**
	 * 
	 */
	private static final long serialVersionUID = 1L;

	@Override
	protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
		// TODO Auto-generated method stub
		String username=req.getParameter("uname");
		String upassword=req.getParameter("upwd");
		System.out.println("用户名："+username);
		System.out.println("密码："+upassword);
		//super.service(req, resp);
	}
}

2，新建login.jsp 页面

<%@ page language="java" contentType="text/html; charset=utf-8"
    pageEncoding="utf-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>Insert title here</title>
</head>
<body>
	<form action="<%=request.getContextPath()%>/LoginServlet" method="post">
		用户名：<input type="text" name="uname"><br/>
		密 码：<input type="password" name="upwd"><br/>
		<input type="submit" value="提交">
		<input type="reset" value="重置">
	</form>
</body>
</html>

3，配置xml文件

<servlet>
  	<servlet-name>LoginServlet</servlet-name>
  	<servlet-class>com.djx.sevlet.LoginServlet</servlet-class>
 </servlet>
  
  <servlet-mapping>
  <servlet-name>LoginServlet</servlet-name>
  <url-pattern>/LoginServlet</url-pattern>
  </servlet-mapping>

还可以通过HttpServlet中的doGet和doPost方法实现上述功能，修改LoginServlet.java文件代码如下：

package com.djx.sevlet;

import java.io.IOException;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.sun.net.httpserver.HttpServer;
import com.sun.net.httpserver.HttpsServer;

import sun.security.krb5.internal.SeqNumber;

public class LoginServlet extends HttpServlet{
	/**
	 * 
	 */
	private static final long serialVersionUID = 1L;

/*	@Override
	protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
		// TODO Auto-generated method stub
		String username=req.getParameter("uname");
		String upassword=req.getParameter("upwd");
		System.out.println("用户名："+username);
		System.out.println("密码："+upassword);
		//super.service(req, resp);
	}*/

	@Override
	protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
		// TODO Auto-generated method stub
		System.out.println("进入doGet方法");
		doPost(req, resp);
	}

	@Override
	protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
		// TODO Auto-generated method stub
		System.out.println("进入doPost方法");
		String username=req.getParameter("uname");
		String upassword=req.getParameter("upwd");
		System.out.println("用户名："+username);
		System.out.println("密码："+upassword);
		super.doPost(req, resp);
	}
	
}